Well I think splitting them into 5k to 10k blocks is good instead of one large block. And no you do not have to make several addresses to do this as you can just send the 5k or 10k blocks to your same address which makes it easier. I currently have 9 10k blocks which seem to be staking well so I just left them like this for now however since the network weight is growing I noticed that some days I don't earn as many stakes as other days. But overall splitting them up into 5k or 10k blocks should do well over the long term staking May.