Snapshots simply capture the signal strength and other WiFi measurements in a particular location. Since MetaGeek products do not have the ability to import floor-plans, we cannot perform predictive heat-mapping. For this you would need a dedicated site-survey tool like TamoGraph or VisiWave.
You can certainly take multiple Snapshots in one large room and denote each Snapshot with a locator, for example “Master Bedroom East” and “Master Bedroom West”. If you plan to take multiple Snapshots to be more precise, you will want to consider a MetaGeek Plus Pro subscription here which allows for unlimited Snapshots. Otherwise, a standard MetaGeek Plus subscription only allows for 3 sites and 20 Snapshots per site.