Hi!
Need a little help

Searched and looked but couldn't find anything that could help me.
I have a space of L:115cm and W:70-80cm and the idea is to attach the desk with only joists along the wall, this is a concrete/stone wall. There will only be a computer screen, speakers, and a few small items.
I don't want any legs or brackets.
Will it hold? How can I make it hold? What type of anchor bolt or alternative should I use? Thickness of the joists, etc.
Would be great if you could help me fix this!
Best regards, Nile!