Eh hem!...Subwoofers... What do ya know?

1) From what I read here, it seems like multiple in-wall subwoofers would be a good swarm solution...yes/no?

Yuck! The beauty of DBA is quantity matters more than quality. But, come on! A man's got to know his limitations.

2) Millercarbon: what subwoofers do you use for 16ohms?

Morel 10", which are a nominal 8 ohms each. With four subs and two amps you can get a total 4, 8 or 16 ohms simply by changing the way they are connected to the amp(s). 

I only have 1 powered sub. No DBA. I found that modeling my room, which is an “L” shape, and using it to model a horn, resulted in incredible bass, fast and tight. 

Pouring money into the problem is back-asswards.

I use just one ML Dynamo 700w sub right now to compliment my Maggie's.
Strongly considering adding another though.
Room can really only handle two as far as placement goes.
Would a pair work diagonally opposite each other?
So say one front left, the other rear right or?

And I don't suppose anybody would know if  just one wireless transmitter would send signal to both of them?

After doing lots of reading, research, and listening, I went with a pair of the new Vandersteen Model 3 Subs. I liked the way they integrated with the main speakers. I will take delivery in a couple of weeks--they are in shipping. I will let you know how they work.