Baby monitor?

I don’t think baby will be away from me very often as he’ll be sleeping in the same room as me and our house is so small with thin walls that even if I’m downstairs I could hear him through the floor. And when we got to his dads its a studio flat so all in one room anyway so it’s highly unlikely he’ll be left on his own at any point!

Is it likely to just be a waste of money that will never get used? Or am I underestimating how much he’ll actually be alone?