4d scan anterior placenta

Hi all I’m currently 27+4 first pregnancy my partner and I really wanted to go for a 4d scan this week but the clinic closest to me pretty much said it’s too early for one they said to rebook in a few weeks time! Everywhere I’ve read says to get one from 27 weeks before they grow too big and squish into the placenta. Soo I would rather go elsewhere for a scan as I didn’t like how they spoke to me but the earliest I can book one for is 2 weeks time where I’ll be 29 weeks. Is this ok for a 4D scan?? Has anyone else had one around this time with anterior? We don’t want to leave it too late 😞