Nap difficulty

My baby is almost 3 months old. Falls asleep on own in bassinett at night, can soothe self to sleep, wakes up 3 times to eat.

Napping on the otherhand...I've been watching for sleepy cues, watching wake windows. I have tried mamaroo, I've made the room dark, turned on sleep machine, put him in sleep sack, feed to sleep, pacifier, tried him sleeping in basinett, on the bed (with supervision). I have no success unless I take him out of the house, driving and walking around