Resize but keep position

Or it may be easier to just group the layers and transform the group.

I also created a script for this, I'll dig up the topic link later (the code isn't protected).

Edit:

https://community.adobe.com/t5/photoshop-ecosystem-discussions/how-do-i-scale-multiple-layers-while-keeping-them-anchored-in-place/m-p/13157052#U13160114

Hey there! There's no native "Transform Each" function in Photoshop, but there's a script to do it. You can get it on GitHub here. (if you are unfamiliar with GitHub, you can "Save link As" directly from this link, or open it and download from the button on the right, or by pressing Cmd+Shift+S). 

You select all the layers you want to transform, run the script (File > Scripts > Browse), and it will transform each of the selected layers individually and keep their position.