One problem with placing mattresses side by side, especially when buying an additional mattress to supplement an existing one, causes Mattresses with varying thickness
This can be solved in 2 ways.
1. Mattresses with thickness differences of less than 1 inch can be used. Plywood Mattress foundation

2. Can be used when mattress thickness difference exceeds 2 inches Topper. Place on the mattress to equalize the mattress height.
However, the best solution is to use mattresses of identical thickness and model, as after a period of use, they will compress at similar rates.
Unlike using toppers or plywood boards that compress, unlike the mattress itself.

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