First-off thank you for coming here and asking before you bought them! You don't know how many people get excited about their purchase and come here for approval! You may decide, in the end, for your needs, that the soundbar and in ceiling is
your best option; however, you will know the trade-offs and make an informed choice!
The people here are into audio and looking for a realistic and open soundstage.
You will not get that from having your front three speakers all in the same box! For a typical listening room, you are 10-18' from the TV (and front speakers). Having the LCR all within a 4' (or less) span. The sound for movies is mixed with the idea that your L & R will be spread out. Here is a simple discussion of speaker placement:
https://sewelldirect.com/learning-center/speaker-placement
Have you considered On-wall speakers? They are usually about 4" deep and mount flat on the wall.
(I am not recommending this model, I have no idea of their quality, it was simply the image I found first)
The speakers are more conspicuous than in-wall, but if it is more about not having speakers "in" the room than their visual presence, this is a good option. Since this is a basement, in-walls may be difficult.
Just wanted to throw out another possibility.