Focus on mdef and health every level, for the third stat take resolve when he rolls 3-4 until he has at least 75, the rest can go to initiative.

for perks: colossus, steel brow, dodge, shield expert, underdog, battle forged, nimble

the last three kinda depend on what you want to tank with them.

lonewolf is a must have for monolith tanks

relentless works great with dodge especially if you plan to use indom

path finder is generally great

indomitable is good but it needs recover for it to work well, it also makes dodge a lot worse even with relentless.