No, on average you have the same chance to stake whether all your SLR is in one address or if it is split over many.  There is a minimum amount of SLR that is valid for staking TBH I never looked for what it is, but it is less than 1 SLR, so assuming you have at least 1 SLR on each address it doesnt matter.

Proof of Stake works by saying your chance of staking increases by the number of coins you have, so if you have 1000 and I have 10, you are 100 times as likley to stake in a given time period as me.  Now consider if your 1000 are on one addres, and I really have 100 addresses with 10 coins on each one, each of my addresses on its own has 1/100th of your staking potential, but I multiply that by 100 addreses and it is equal to yours.