Hi Elbert,
No, it should just work fine. Just make sure to follow our install guide – https://updraftplus.com/faqs/how-do-i-install-updraftplus/
I would also suggest upgrading to UpdraftPlus Premium rather than buying add-on individually. UpdraftPlus Premium (which bundles all add-ons) is available in packages consisting of 2, 10, 35 or unlimited site licences. This is often a much better deal when going for more than a couple of sites.
Best Wishes,
Bryle