I think the 1 XLR at a time payouts you see at the moment are actually accumulated rewards paid 1 XLR at a time, but I may be wrong.
Thus: 0.9 XLR per block is currently distributed 45% to PoW miners and 45% to MN holders, thus for MN 0.9x0.45/701 (there are about 701 MN holders now). So each block adds a bit up to your reward which is paid out when it reaches 1 XLR
And when PoS starts its first phase, the MN will get say 1x0.45/701 instead for each block.
No it's definitely a total of 2XLR per block at the moment, you can check that by looking at the explorer, So out of that 2 XLR 45% goes to a MN (which is 0.9XLR) and 45% to the miners (another 0.9XLR) with the other 10% available for the budget system (0.2XLR) although I don't believe that's being used at the moment so they split that between the miners and MN holder so they get another 0.1XLR each making 1 each.