I've been having good success using the Underslung Control Panel by "universaljoint" and Horizontal Mounting Brackets by "zcubed" , but I really wanted my setup to be slightly angled. I think this is ideal for reducing friction in the bowden tubes before and after the MMU2.0. I know its greatly reduced jam-ups for me. So I took the mounts and remixed them into many different angles and the drop number listed is the amount of drop from the top of the Prusa i3 frame. MK2.5 and MK3 compatible.
For me, I prefer the: 15 degree and 10mm drop brackets. I tried to designing some 20, 25 or 30 degree mounts, but the mounting hole would intersect with lower frame tab, so I gave up. Hopefully there is a option here you like.
FYI - I did not use any of the Underslung Control Panel design data for my remix - I just listed it to show my respect and to link this mount bracket to his design for other to find more easily.
Prints with no brim or supports.
MMU2 Horizontal Mounting Bracket
MMU2 Underslung Control Panel
I've also included the Fusion 360 model if you want to mess with it.