You could try, but there are no guarantees of them remaining peaceful as they mature. Be prepared to either get rid of some before they get too beat up, or add a lot more angels to spread the aggression.
For full grown adult angels, you should have 10 gallons per fish, 5 gallons per fish for potential breeders. Angels begin to pair up somewhere around 8 to 10 months of age, they are usually anywhere from half dollar to dollar body size. A fully grown angel can reach 3" to 4" body size.
You could go as high as 10 angels in a 55, if you overfilter & do more than the average water changes. In a situation like that, 50% to 70% weekly water change would work. With that amount of angels, any aggression from pairing would be spread around so many fish that the likelyhood of one getting singled out & pounded on is remote.
I did that with an extremely aggressive pair of marbles. They must have been too closely related, or one was infertile, couldn't get a spawn to hatch successfully. If they were in a tank with 4 to 6 other angels, they would beat on everyone. I ended up putting them in this tank before I gave them to a buddy of mine;
It's a 55, try counting the angels. Count the filters. That tank gets 60% water changed 3 times weekly. If I took 3 of the larger ones & put them in a 29, there would probably be a battle.
Angels either need to be kept as pairs when mature, or in a pretty large group.
Tolak