I have a website with multiple extensions for each country/language.
Domain.com, domain.it, domain.es, domain.fr … etc
All domains are pointing to the same IP.
I have 10 domains with different country extensions, pointing ti the same IP.
Cloudflare plans are generally per domain. So if you want to use all these domains on Pro plans you will need ten such plans.
Alternatively, you could only upgrade the .com domain and redirect the country-specific domains to e.g. domain.com/[CC]. Of course this would require a change to your main domain.