Best (and safest) way to charge an array of batteries wired in parallel?

Pardon the crude image. These are 12 volt, 7.2 Ah batteries, all the same make, and model. They’re from a server backup. Can, or should, I charge them like this or would it be safer or more power efficient to charge them individually? I was hoping to charge them like this to save time. In one of my prevous questions (on a different topic) someone told me to charge them either individually or in groups no more than 3.

Thanks for any thoughts.

https://i.redd.it/wzeue5z90cu31.png

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