Yep, that's one way to do it. Mostly, it depends on whether you're using the sounds of both amps at the same time, or if you're using the sound of one and using it to drive the other amp.
If you're using both amps to get your sound:
Amp 1 Send >> TF In 1 >> TF Out 1 >> Amp 1 Return
Amp 2 Send >> TF In 2 >> TF Out 2 >> Amp 2 Return
If you're using one amp to drive the other:
Amp 1 Send >> TF In 1 >> TF Out 1 >> Amp 1 Return
………………………..>> TF Out 2 >> Amp 2 Return
