It’s up to you whether you risk being asked or not. Most people don’t get asked to show a return ticket, occasionally someone will be asked. I arrived in April on a 60 day tourists visa, didn’t book a return ticket and was never asked to show one 😊
I’m planning on booking as I go and I just put my sha ++hotel (coming on the sandbox scheme) and got approved 😊 so I’d just say put your first accommodation for the first week or something xx