Depends on the material
Yup, you could boost your terries with boosters for MCNs - I wouldn't think it an issue for bamboo or hemp boosters. But microfibre boosters need another layer between them and baby's bottom as they will dry the skin out too much. In the early days you may only need a couple of layers of bamboo with a cover - you could do without the terry. (It is very bulky, particularly on a newborn.)
Having said all that, there are heaps of people out there who still use terry flats! There's nothing wrong with them, you just need to change more often (and of course, they are a bit more work with the folding, etc.)
HTH!