My cricket keepers have never come with bowls, sure they ain't plastic lids to put over the end of the 'tubes', like? That's all mine came with lol. I just throw food in with 'em, they find it.
Put them in the fridge for 5 mins, that's what I do, slows 'em down good haha.
I leave them in the tubs they come in, but that's because I don't have many and use them quickly.
Vivarium'll be fine on the floor I should imagine.