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The number of indoor heads or whether a multi-split or multiple 1 indoor to 1 outdoor units is not explicitly modeled.

If you want to calculate capital costs using discrete system sizes, you can manually calculate for each home using the reported cooling capacity field (reported heating capacity will refer to aux heat sizing) in the results.csv. However, that would require knowing the maximum heating capacity for the modeled MSHP at the design temperature for each home in your run, which is not straightforward to calculate (you can likely get pretty close with the NEEP spreadsheet).

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This is a minor point, but since unit sizing (e.g., 3x 12 kBtu/h units vs. 4x 9 kBtu/h units does affect performance to some degree, the options in ResStock, because they are primarily based on data from real units, do have implied system sizes in terms of their performance. By looking at the options listed in BEopt, you can see that the SEER/HSPF levels for the "MSHP, SEER 14.5, 8.2 HSPF" and "MSHP, SEER 29.3, 14 HSPF" options both align with 12 kBtu/hr units (1 indoor to 1 outdoor).

15 kBtu/hr units have slightly lower rated SEER/HSPF and 9 kBtu/hr units have slightly higher rated SEER/HSPF, however 15 kBtu/hr units may actually outperform 9 kBtu/hr units since they have higher efficiency at lower compressor speeds.