Robens - Sprinter 2

70cm is very wide, are you sure you need mats that wide? 2 of them wouldn't even fit in a Hilleberg Nammatj 2, and that's a very spacious 2 person tent. I would say get less wide mats, or failing that, you'll need a 3 person tent. Tunnel tents generally offer the most spacious interior. The Robens Sprinter (2 or 3) is a fantastic tent for the money. You could use a footprint to cover the vestibule area, but I wouldn't worry about things getting wet, let them get wet, presumably you're in the UK, in which case, at some point things are going to get wet.