Pierre Trick

You have 13 logos, I think the better way is to create 4 “columns blocks”, with 4 columns inside each “columns block”
Copy and paste the block below to keep the same structure

Organisation a page with tables is not a good practice. Tables have to be used only to organise data.
That’s why you can’t insert block inside table cell.(no option is available to manage images, etc…)

This is how wordpress works, in order to respect the web specifications criterias.