I think well integrated subs improve most any speaker. A few exceptions for sure. But as others have suggested might be best to get them in your house and see what you think and go from there.
Once you get the 812’s dialed in, you will have an excellent sounding setup. Subs aren’t that hard to set up if you do it properly, especially REL’s. Your room WILL be a factor though, and treatments would be prudent.
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