Tip: Even premium themes are free to demo and go in and play with the visual editor settings
Some themes have a top announcement bar where you can enter html into the text field letting you effectively manually insert code for a logo list.
Though alot just push the raw text through.
There's also doing this to the menus in themes with top navbar but would require heavy CSS customization.
Really though just do this through a theme customization, a feature like this is not something your choice of theme should ever revolve around.
The current conventions in most themes is masthead area with specific parts in it then configurable sections after the masthead.
This means there not even a custom-liquid block/section you can insert.
To create a complete section shopify has example code to start with https://shopify.github.io/liquid-code-examples/example/logo-list of course it needs to be modified to link to collections.
Merchants need this customization for any chosen theme contact me at email@example.com
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