Depending on the size of the critter in my 41 qt rack it will get either no hide or one hide. With just one I find the snake will "turtle" it onto and off of the heat as needed if I put the water bowl up front.

Personally I prefer to feed f/t. A good rule of thumb is to feed a rat that is 10% of the BP's body weight weekly, up until the snake is 500 grams, and a small rat every week or so thereafter. If the snakes are still young and growing I would try ASAP to get them off of live feeders as they'll be hungrier and more inclined to eat rather than if you wait until they are adults. Offer live a few times to make sure they're acclimated to their new homes and then start converting them. Also if they refuse the f/t for a few weeks don't worry about it, they won't starve.