Help with wall mounting speakers for yamaha rx v383

Hi everyone. Was hoping someone could help me figure out how to wall mount the speakers for a yamaha rx v383. The imgur link below shows what the speakers look like and where they go on the wall. The previous people in my building had their speakers mounted. So one has four drill holes already and another plate has two drill holes. Then there are three center ones that have no drill holes as I assume they just did not bother putting speakers there and only had rear speakers. Are there special mounting things I buy?

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https://imgur.com/a/aGhqF2R