Effectively, if you’re predicted A*AA, you want around 3 in this range and then 2 at AAA to give you a bit of leeway and a safety option.
You don’t want to apply to 5 LNAT unis just in case it goes awfully as well.
If you want to apply to Cambridge, have that as a choice and then something sensible might be Cambridge, UCL, Bristol, Nottingham and Exeter or something along those lines.