You have not told us what size tractor you have.
That said: a "3 point backhoe" is a very poor idea.......for ANY size tractor!
A backhoe hung on a 3 point system is very likely to rip the top link (casting) connection out of your tractor.
There is a long history of this occurring, though some do beat the odds, if digging carefully, and in light soil.
Cracking the top of that casting is guaranteed to create a MAJOR expense!
You should mount a backhoe on a subframe only!