Mattiemax

Hey All, looking bit of help/advice. I did have a home cinema setup I got a number of years ago which is an all in one Atmos Onkyo system (Onkyo HT-S7805) The subwoofer stopped working so decided to start updating my speakers etc. I still like the AV receiver (HT-R695) so just updating the speakers at the moment. I got the Klipsch 121SW sub and ordered the R-30C as my centre (it the only one that will fit my tv bench) anyone have this and can report what it is like? As for the rest I was thinking R-50M (for front left and right) and R-40M (for surround Left and right) should I keep them all the same I.e. 4x R-50 or R-40 or is mix ok? And then for the moment 2x R-40SA for the front Atmos. To those in the know how does that setup sound? Would love floor standing speakers but my movie room wouldn’t be big enough to have them hence went to bookshelf. Any thoughts or advice would be great