It's probably fine, but Onkyo haven't been "flavor of the month" for quite a while. It has Atmos and DTS:X, and unlike quite a few Onkyo products is HDCP 2.2 compliant on more than just one or two inputs.
Should be fine, but there are plenty of other 7 channel receivers out there, and quite a few nine channel receivers for not much more.
No idea about speaker matching, sorry.