Number of videobridge2-server for 500 people

would i know that how many videobridge2 i need for 500 users with open voice and camera.
I just need an approximate number
it will be max 10 conference at the same time and one conference will be max 50 people.
And how many vCpu and ram does need for one videobridge2 server?
I read other topics but i couldnt find a number and videobridge cpu and ram.Thank you very much, have a nice works.