On curves I cut mine down the middle to bend and cut manageable sections off the roll (24” sections) I didn’t use glue but had Foam pins I would use to hold in place adjust as needed. I use Atlas track so then would screw down track and use a few more screws to hold foam in key spots before removing foam pins. So on a curve I would slide in the next section to be flush with the last section pin down and continue to shift and pin as I installed then screw down Track then road bed
I’ve moved some track after so using screws was easy to move foam bed to new location or when I shifted foam bed to obtain a equal spacing
