If we have Qora on more than one address, should we make a separate transaction for each address or first move them all to one address and then make only a single transaction to the genesis address?
My suggestion here would be to combine them into a single address, then burn from that one. That way it is easier to keep track of on the QORT chain. Also, the larger amount you burn from one address, the larger chunk of the % of each block you obtain.
Overall it won't matter if you do it either or way... you will still end up with the end result being the same. However, if you do it from one address, you will get a bigger 'weight' of the reward % dedicated to those who burned QORA in every block on QORT chain.
Hopefully this helps.