Help CPA - use subdomain for landingpage

Hi guys need some help from the experts or people that have experience working with CPA network.

I already have a domain and hosting plan. I was planning to use it for my blog site, but i will need to get another one for keyword reasons.

So my question are

* It is okay to use a subdomain for the landing pages. I want to use a subdomain since i will make several landing pages. Not necessarily for the same niche.

* If i use this method, there is any change to get banned from social media accounts? (IG, Twitter, etc) . Since all the landing pages will come from the same domain. (not a network expert just saying)

Hope you can help me

Thanks in advanced

Better buy few more domains, just to be sure. You have domains on Namecheap for $1.