How to place a form in all subsites and process i on 1 url?

I need to place a form in all my subsites and home page. It's placed on right column. It's action is "/". If there are some errors I must display them.

I made Form class etc. I display it via {{ form.as_p }} and designed all.

The problem is - how to put it on all sites? I don't want to make form instance in all my views functions.

What is the best solution for that?

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