yep, chest/belly is good, at least I found it was with Milo, who also hated tummy time for a long time.
He had such a heavy head, he really used to struggle to lift it, and when he did he couldn't hold it up for long so would end up bumping it on the floor

So I persisted with him on my tummy and chest, and he found this a lot more agreeable. After a week or so we tried on the floor again, at increasing intervals until his strength increased..