5 tps/hz, thats what prod uses, and that is what you should use, but to make your server "good" you need to implement a proper system to use the servertime/clienttime, and that you need it for shatters or shaitan, thats a lie, prod has done it with 5, so you can do it with 5 too, and remember that the sinkrate for the quicksand in the tomb is based on your server ticks, that means that more ticks does make a tomb with quicksand unplayable in my opinion.
PS: think logicall, count to 5 in one second and repeat that, do you really need more than 5 for a game like realm? its not like battlefield or any other fps where you need at least 30+hz, the game was never designed for more than 5hz