Use directory instead of custom domain (like /blog)

Hi,

I am interested in starting a pro plan with write.as but for seo purpose a directory (/blog) is better than blog.domain.com. Competitors like esyblog and ghost offer these kind of installs, mainly handled via cloudflare of hostforward.io.

I was wondering how others looked at this issue and how others have fixed this?
I looked at writefreely but only have an apache hosting and am not familair with commandline.