OpenCart WP plugin + Avada Theme

Hi everyone,
I have a big challenge ahead of me. I need to install the option of ordering goods on the website: Topcoloringpages.net
It's quite a big website running on Avada theme. I considered several options and I've chosen to install OpenCart Wp plugin to achieve that goal.
But I have several concerns regarding this change:
1) Avada Theme is a pretty complex theme so I'm wondering if there are any possible conflicts between it and OpenCart plugin? Did anyone combine those two?
2) Does anyone have experience with SEO performance when using OpenCart WP plugin?

I will also point out that at the moment the transfer of the entire website to the OpenCart engine is not an option. Such a move will only be possible once the sale has grown enough that it will become a significant source of income and will require more advanced solutions.

I will be grateful you for any suggestions.