You can fit an entry stamp the size of your thumb. Same for the exit.
BTW Thai immigration are very OCD when stamping your passport. I can guarantee your exit stamp will be right next to your arrival stamp when you leave. Not like some stupid countries that stamp you in on one page and out on another.
I remember some years back and us doing this. Photos of us outside and inside our house. We took photos of us with our 2 Dobermans and never got the visit. 🤣