Hi, I'm looking to change my downstairs bathroom to a Wetroom. It's currently an enclosed shower with a wooden floor on joists. I'm going to have the wooden floor remove and a Wetroom installed with a tiled floor. Please see picture of upstairs bathroom showing large tiles on the floor and mosaic tiles in the shower area, upstairs refit used a 1500 x 800 pro former. My question is regarding the shower tray proforma. I would like the linear drain to be along the wall (1500 x 800cm) so prefer that one, or the other option would be a smaller square pro former with a drain under the shower head (900x900) . Please see rough drawing. The length of the bathroom is 190cm. My question is, is it better to have a large pro former 1500 x 800 to ensure no leaks when showering as it covers a wide area or can I consider the smaller 900 x 900 with the linear drain under the shower. I know the floor will be sealed but just wondered if having a larger pro former would be the wiser choice ? Would appreciate any help, Thank you.