4D scan with anterior placenta?

Hey, I’m looking at booking a 4D scan but I have an anterior placenta and really not sure what gestation to go. WTTW suggest between 24-27 so I’m thinking 25+3 days (purely because it’s the only date my family who will be coming can do!!) but just wondering if this would be too early or if anyone else had a 4D and could share their experiences and what gestation they went. I don’t want to leave it later than that for the initial one just incase baby is in an awkward position and they need to book me in again as don’t want her to get too big or for the placenta to be in the way. Any advice or experiences would be great.