where do you put him/her down for a min?

Colleen • FTM living with hubs and lil Declan Patrick in sunny Florida...
Im curious where other mommies put their LOs down momentarily, say to clean or just so they can play. He always did well in his bouncer but he's getting too big for it at six months. He can't quite sit up on his own so far, so he currently either sits in an upright chair that has a play table around it, lays on his keyboard play mat, lays on a blanket, or hangs out in the jumperoo. Am I missing other options? I'd love to encourage him to sit up more. Thanks!