I have Revels for surround speakers in my 5.1.4 setup. 4 x C263 for atmos and 2 x W563. They are all in-wall, in-ceiling. I found them a little bright but most of the surround effects sounds are of that kind. I am not sure if in-wall is bad vs on-wall. Them being in-wall really blends into the room. My HT dimensions are 15x17x8. I really enjoy my setup. The atmos demo on xbox one S puts out a great sound. For the record they are paired with HSU-VTF-2 sub and I am using Marantz SR6012 as receiver.
My neighbor has F36 as fronts and I didn't find them compelling for the price, $1000 each, they sell. So I am still researching on what to buy. Using Elac B6, RSL CG23 as L/C/R for now.
With those many number of speakers in the room, 2 x sub of that size, may be having all speakers in plain-sight on-wall may be overwhelming. But that is just my opinion.
Also I would advise to go with 1 HSU-VTF3 and order second piece only if you feel the need for it.
Hope this helps.
HT 5.1.4 : Marantz SR-6012; Elac B6 LR; RSL CG23 C; Revel W563 Surrounds; HSU VTF-2 MK5; Revel C263 Atmos; Epson 5040ub
Family Room 5.1: Yamaha RX-V475; Martin Logan MLT-2 HTIB; LG 65"UHD