The comment is mostly about the so called "atmos speakers", I should've written that from beginning.
I would only put serious money/effort into the two stereos and the sub(s). Maybe the center too but that is already close to nitpicking territory. IMO, the rest can be (almost) whatever. Will probably help if they are ~same but even that is not such a big thing. Yes you can sweat a lot about stuff like directivity/etc but IMO that is deep into nitpicking territory.
Here's a nice
video series about what needs to be done to 'fix' audissey, particularly calibrate those very low quality mics (+- 6dB). Huge effort and huge changes. Or just use a better mic & room correction