I really prefer the bigger speaker for the main L/R. Is there any error thinking getting M22 and place them up above the bookshelf will sound better than M2 at the ear level for the front L/R?

Please advise,
Joseph

No matter what speakers you decided on, small bookshelf, mid sized bookshelf, or larger floorstanding speakers, the ideal position would be to have the tweeters as close to seated ear level as possible.

Normally, bookshelf speakers would be on some form of speaker stand to achieve this height.

For HT applications using a center speaker, again, the ideal position is to have the L/C/R tweeters at seated ear level.

Of course, this may not be possible in all applications.

I had my M22s way above my sitting position and just angled them down abit, they still sounded great.