A pair of each would fine if the water is kept warm enough for rams. They like 80+ which can create issues with stocking.
The next hurdle is getting a pair of angels.The best way is to get a group of like 6 and let them pair up.
Unless you will be happy with 1 angel the group is best.
Over time you will need to rehome the angels .
Give the fish plenty of line of sight breaks and a cave or so for the rams.