In the past, some Senecas could accomodate a stackable pair while others could only use a combo unit based on the floorplan. So machine brands would likely differ if the same restrictions are present in the brand new Seneca.
I installed a Splendide combo in my TS and we love it!
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST