Level 56-57 NM FATEs should work.

Sturdy targets and level sync to 60/61.

So, northern part of Churning Mists.

You can also try doing FATEs in the Maker's Quarter in Dravania Hinterlands if you don't mind having your level 62 skills.

Of course... You can always just queue up to level 60 Trials/Dungeons too. Like normal versions of the Trials you wanna do.