My signature size on two different size camera's photos using Elements 14

Hi All.

My question is....

I have two cameras and they are 1, at 12mp and the other at twenty four mp.

1. Using  Adobe Elements 14, if I want to put my signature via a batch on the 12mp camera photos then I use about the 30 size and that's fine.

2. If I use the 24mp camera i have to use a setting of about 60 or a bit bigger.

3. If i forget to resize for what ever camera, then they will show as either a too smaller or too bigger size signature.

4. Is there a way to set the signature up so it auto sizes irrespective of which size camera that i used.

5. Both cameras are set at 3.2 ratio.

Many thanks in advance.

Ken R  (in the UK)