diff --git a/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp b/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp
index 0f9b1f64511..cc7866185ed 100644
--- a/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp
+++ b/ApplicationLibCode/ProjectDataModel/RimMultiPlot.cpp
@@ -61,10 +61,8 @@ RimMultiPlot::RimMultiPlot()
     reorderability->orderChanged.connect( this, &RimMultiPlot::onPlotsReordered );
 
     RiaPreferencesSummary* sumPrefs = RiaPreferencesSummary::current();
-    CAF_PDM_InitFieldNoDefault( &m_columnCount, "NumberOfColumns", "Number of Columns" );
-    m_columnCount = sumPrefs->defaultMultiPlotColumnCount();
-    CAF_PDM_InitFieldNoDefault( &m_rowsPerPage, "RowsPerPage", "Rows per Page" );
-    m_rowsPerPage = sumPrefs->defaultMultiPlotRowCount();
+    CAF_PDM_InitScriptableField( &m_columnCount, "NumberOfColumns", ColumnCountEnum( sumPrefs->defaultMultiPlotColumnCount() ), "Number of Columns" );
+    CAF_PDM_InitScriptableField( &m_rowsPerPage, "RowsPerPage", RowCountEnum( sumPrefs->defaultMultiPlotRowCount() ), "Rows per Page" );
 
     CAF_PDM_InitField( &m_showIndividualPlotTitles, "ShowPlotTitles", true, "Show Sub Plot Titles" );
     CAF_PDM_InitFieldNoDefault( &m_majorTickmarkCount, "MajorTickmarkCount", "Major Tickmark Count" );
diff --git a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp
index 11092f7b0c1..2f617bd3454 100644
--- a/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp
+++ b/ApplicationLibCode/ProjectDataModel/Summary/RimSummaryMultiPlot.cpp
@@ -61,6 +61,7 @@
 #include "RiuSummaryMultiPlotBook.h"
 #include "RiuSummaryVectorSelectionUi.h"
 
+#include "cafPdmObjectScriptingCapability.h"
 #include "cafPdmUiButton.h"
 #include "cafPdmUiCheckBoxEditor.h"
 #include "cafPdmUiComboBoxEditor.h"
@@ -113,7 +114,7 @@ void RimSummaryMultiPlot::clearLayoutInfo()
 //--------------------------------------------------------------------------------------------------
 RimSummaryMultiPlot::RimSummaryMultiPlot()
 {
-    CAF_PDM_InitObject( "Multi Summary Plot", ":/SummaryPlotLight16x16.png" );
+    CAF_PDM_InitScriptableObject( "Multi Summary Plot", ":/SummaryPlotLight16x16.png" );
     setDeletable( true );
 
     CAF_PDM_InitField( &m_autoPlotTitle, "AutoPlotTitle", true, "Auto Plot Title" );
diff --git a/GrpcInterface/Python/rips/tests/test_summary_multi_plot.py b/GrpcInterface/Python/rips/tests/test_summary_multi_plot.py
new file mode 100644
index 00000000000..b902f5da3fc
--- /dev/null
+++ b/GrpcInterface/Python/rips/tests/test_summary_multi_plot.py
@@ -0,0 +1,56 @@
+import sys
+import os
+
+sys.path.insert(1, os.path.join(sys.path[0], "../../"))
+import rips
+
+import dataroot
+
+
+def _create_summary_multi_plot(rips_instance):
+    """Import a summary case and create one summary plot, returning the
+    newly created RimSummaryMultiPlot wrapper."""
+    case_path = dataroot.PATH + "/flow_diagnostics_test/SIMPLE_SUMMARY2.SMSPEC"
+    summary_case = rips_instance.project.import_summary_case(case_path)
+    assert summary_case.id == 1
+
+    collection = rips_instance.project.descendants(rips.SummaryPlotCollection)[0]
+    collection.new_summary_plot(summary_cases=[summary_case], address="FOPT")
+
+    multi_plots = rips_instance.project.descendants(rips.MultiSummaryPlot)
+    assert len(multi_plots) >= 1
+    return multi_plots[-1]
+
+
+def test_summary_multi_plot_layout_is_scriptable(rips_instance, initialize_test):
+    """The column/row count fields on a summary multi-plot are exposed over
+    gRPC and round-trip through update()."""
+    multi_plot = _create_summary_multi_plot(rips_instance)
+
+    # Fields are readable (default seeded from the Multi Plot Defaults
+    # preference; the exact default is environment dependent).
+    assert multi_plot.number_of_columns in (1, 2, 3, 4)
+    assert multi_plot.rows_per_page in (1, 2, 3, 4)
+
+    # Set, update, and verify the new values are persisted server-side.
+    multi_plot.number_of_columns = 3
+    multi_plot.rows_per_page = 2
+    multi_plot.update()
+
+    refetched = rips_instance.project.descendants(rips.MultiSummaryPlot)[-1]
+    assert refetched.number_of_columns == 3
+    assert refetched.rows_per_page == 2
+
+
+def test_summary_multi_plot_layout_override(rips_instance, initialize_test):
+    """Forcing a 1x1 layout works regardless of the preference default —
+    this is what a headless export uses to get deterministic output."""
+    multi_plot = _create_summary_multi_plot(rips_instance)
+
+    multi_plot.number_of_columns = 1
+    multi_plot.rows_per_page = 1
+    multi_plot.update()
+
+    refetched = rips_instance.project.descendants(rips.MultiSummaryPlot)[-1]
+    assert refetched.number_of_columns == 1
+    assert refetched.rows_per_page == 1