First of all, a BIG THANKS for doing this! I think I'll order one and ask my dealer to install it.
Can you confirm 'WHAT' exactly you ordered? I just went to the MillerCat site, and checked 2021/2022/2023, and checked all three Rav4 models - non-hybrid, hybrid, prime - but only one item showed up:
View attachment 411612
I was led to believe by the person I spoke to at MillerCat that there were three DIFFERENT shields for the three RAV4 variants.
Regarding the spacer you omitted; on my girlfriend's Prius, which has the MillerCat fitted by the dealer, I do hear a 'rattle' due to the shield but only when accelerating 'somewhat aggressively'; typically when the ICE kicks in from battery only. So omitting the spacer may 'fit', but it may lead to issues down the road. I guess I'd say, just drive without the audio on for a while and verify!
Thanks again!
PS - it sounds like a tricky/finicky install ... not sure the dealer will do such a good job!