You will typically get lower quality drivers and compromised specs with in-wall speakers because they need to be shallow and fit inside a wall cavity. Read the instruction manuals on whatever models you’re looking at for correct installation guidance, if any.
Perlisten in-walls are the best i’ve heard to date, with the least number of compromises. But, they are well above your budget. Make do with what fits your budget.
Elac has some in-wall speakers that were designed by Andrew Jones (when he was with Elac). He is a smart guy and tends to do a decent job/maximize bang for buck in challenged scenarios. That’s a cheaper option.
Since in-wall itself is a sonically compromised option (to begin with), lower your standards and don’t bother spending all that much.