What's your view on playpens? We've bought one for our youngest, never seemed to need one for eldest.
Youngest is 13 months and can't keep out of trouble. We've baby proofed as much as possible but for example, one of our sofas means he keeps climbing up onto the arm and onto the window sill. There's nowhere else we can move it as we have two sofas and the layout of the room means one has to be near a window. Another example is he climbs onto the sofa and gambols around so it's not safe to leave him in the sitting room.
He won't tolerate going in his highchair while I cook and he's even trying to climb out of that. He's got a chair but he can climb out of that too and hates it anyway.
Some people think playpens are cruel but can't think of another way.