That is correct.
(The only additional info I would add is to make sure you are taking the full turn for the character(s) activated with the first tile. You don't get to activate 2 tiles and then intermix the characters' turns like the heroes can.
You activate one tile, do the full turn, and then activate a second tile.)
And it's only 2 tiles per turn, right? Even if one of them is the 'Warning' tile..