What is the best way to keep 2 single mattresses together in a king size bed?

I am renting a house and the bed provided is a king size bed, but the mattress is made out of 2 single ones side by side. This is really uncomfortable as i tend to sleep in the middle of the bed. The mattresses get pushed apart slightly or there is a big dip in the middle. Does anyone have any solutions as to how i can keep them held together?


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