The basic pros and cons of flush mounted speakers i e soffit or wall mounted vs free standing i e in room.
Wall speakers vs floor standing.
In wall speakers pale in comparison to free standing speakers for many reasons.
There are conventional box shape speakers that are floor standing or bookshelf in size.
If you prefer a floor standing speaker you will want your budget to allow the cost difference.
Buy speakers that are designed to do what you want to do.
I have a pair of monitor rs8 floor standing speakers and shifting to small flat.
Free standing speakers tend to sound the best because you have the greatest flexibility when it comes to positioning.
Floor standing speakers typically cost more than an in wall speaker.
If speakers flanking the seating area of a theater can be moved off the floor and into the walls the possibility of a wine induced mishap is greatly reduced.
There is always the option to combine and do both in wall and floor standing speakers.
Speakers on stands next to seating in a dark theater is a recipe for disaster.
The 1 issue is perception of soundstage.
From a decor standpoint though a bookshelf on a stand does tend to look like its taking up less of the space in a room than a floor standing speaker with a similar footprint.
There are speakers that mount inside the wall on the wall.
With all that being said it really boils down to personal preference.
On wall usually means less time spent fine tuning the speaker positions and less chance to make the small incremental changes you can achieve with floor standing cabinets.
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Good in walls are especially well suited for use as surround speakers.
If you do not have space for floorstanders then sell them and buy some standmounts that can be mounted to the wall i e.