Need help with building a logo wall from .SVG or .PNG

Hi,

For some reason whenever creating a logo wall using images, even HQ .PNG files, they look low res and I can never get the sizing right. When I convert to .SVG and use that file format, they look good but all the assets convert to the last .SVG added. I'm not good with html, CSS, etc, but have to imagine I can build a good looking logo wall. Any tips? '