I don't blame them tbh, they've had such a hard time with people showing up to see things in the flesh and then going home to search for it cheaper on line.
Hi, I'm looking at your signature specs and the receiver you have won't support Dolby Atmos. You would have to upgrade that before looking to get new Atmos speakers.
Agree with BB - I'm using the Marantz SR-7009 with the Apex and a bigger MA sub and they work really well with a mid to high range receiver. I'd try the newer SR-7010 along with the 2 BB mention.