My two cents, need to redo the shower

30-in W x 60-in L with Right Drain Rectangle Shower Base (White)

https://www.lowes.com/pd/Sterling-Ensemble-White-Vikrell-Shower-Base-30-in-W-x-60-in-L-with-Right-Drain/3966795

if you want to use tiles again, need to do like this:

https://www.homedepot.com/p/VEVOR-Waterproofing-Shower-Kit-38-x-60-in-Shower-Pan-Liner-with-4-in-PVC-Offset-Bonding-Flange-Polyethylene-Shower-Pan-Liner-LYDZT38X60PVCAUR5V0/320401176