Also--and this is the enabling feature that makes V8 RX7 swaps possible--the eccentric shaft in a rotary is higher in the engine than the crankshaft of a piston engine.
In a longitudinal car, this means that the transmission tunnel is tall, and the relatively small Mazda transmission is very high in the tunnel. This means the tunnel is big enough for a large transmission like a T56 to be mounted low in the tunnel, to mate up to a V8 engine mounted low in the engine bay.
In a transverse car, this means that the axles come out of the transmission several inches higher than they would with a piston engine. This may cause problems with the relationship of plunge in the inner CV joints to suspension movement.
OTOH... if you're going to do a longitudinal 4 rotor swap...
[This message has been edited by Will (edited 10-06-2020).]