2.1
Tekton Epic 15 speakers, price $2200/pair.
https://tektondesign.com/product/full-range-speakers/full-towers/epic-15/#color
7.2.4
$3000 is a miniature compromised budget for multichannel unless you fished around for used and got lucky.
Inwalls sound bad and price will skyrocket above your budget to make them sound ok/stomachable. Hence, cheaper to go with regular bookshelfs and crossover dual subs, 100hz and under.
Andrew Jones Elac Debut 2.0 bookshelf, $230/pair on sale, approx $700 to 800 for 7 bed layer speakers.
https://www.crutchfield.com/p_970DB52/ELAC-Debut-2-0-B5-2.html
Andrew Jones Elac atmos speakers, mount on ceiling at locations per dolby guidelines (or more compromised, use as upfiring modules on top of bookselfs). $230/pair, $500 or so for quantity of 4
https://www.crutchfield.com/p_970DA42/ELAC-Debut-2-0-A4-2.html
AV receivers are a big compromise. Go with a separate AV prepro and multichannel amp/amps.
Above mentioned would be the highest bang 4 buck you came across.