Get one of those that have large doors that open the entire front. Really! You'll appreciate it. Where do you live because the ones that would apply are MidWest Critter Nation in the US (double or single version depending on the amount of rats you're getting), Savic Suite 100 or Savic Suite Royal XL im Europe (again either a double or single), Tiaki Etagere in Europe, and a Critter Nation dupe by the brand Vevor in some countries, not sure where exactly.
Hi sorry I should've said im in UK sorry ill add to the post . Thanks so much for the response really want them to be as comfortable as possible
this one opens fully on the sides tho so it's basically small front doors and fully opens on all 3 on the sides