Hi, i like your idea of floor time while in the bath!
Well i work full time and have a house and 2 rats to look after aswell so i dont spend as much bonding time as i would like to.
They have floortime in the morning whilst i get ready for work and again in the evening whilst im cleaning their their cage and the house.
I think i will move their play area to the bathroom while i am in the bath, like you, so i can talk and watch them at the same time.
I might even tell my partner to do this 2 as he is always moaning that they like me better than him!