Can he sit up? Just wondering if he gets bored / frustrated lying down and needing things to be passed or shown to him. My DD always liked to be involved in things and we found the bumbo really useful until she could sit unassisted so that she could still see things upright and reach for a few toys. I know plenty of people would disagree about the bumbo though, so just my experience there!
As far as IP, you might find this gets easier as he gets older because he won't be as limited in what he can physically do. I didn't used to give her specifically allocated IP time, but when DD was sitting but not mobile and I needed to get something done I used to put her in whatever room I was in so that she could see me and I could talk to her, but with some toys so that she could choose to play. Other than that I guess she got pretty much undivided attention between feeding, changing, bathing, playing, going for walks, errands, etc. IP naturally happened more as she got older, first with mobility and now at age 2 with imagination.