Block size does not mater, you will get your reward, however the smaller the block size the longer it takes to stake. I personally prefer to have larger blocks, since they stake faster. At the end its also important how many coins do you have. If you have >10k you could make block sizes of few 1000s otherwise is probably better to keep the block size few 100s or just put all the coins in one block.
Just play a bit with the values and see what works best for you.