Louis

haven't read a lot of beta x alpha but norainu no yoru's my fave, if you haven't read it yet. (i also need recs lolol)

https://www.mangago.zone/read-manga/exclusive_no_love_zone/

https://www.mangago.zone/read-manga/kashikomarimashita_destiny/

2nd couple is alphax beta

Oo if you mean searching for alpha x beta on here then,
You can click on any manga, scroll down a little under “Comments” should say “Top tags” you can click on any tag and it will take you to a screen where you can search them up !!
If that’s not what you meant then just ignore this loll <3

Have you read The Third Ending? I think the top character is a yandere, but he's not like a huge yandere...

Under The Green Light
Plaything (SA)
I swear I knew more.. I just can’t find em.