PHP 7.2 is currently in development and scheduled for November or December 2017 release. But, SiteGround has already included Release Candidate version for testing purposes on all their servers.
Dev4Press is using Siteground for almost 2 years now, and from the very start, we used Cloud Hosting plan. But, Siteground offers specialized WordPress hosting plans and many other different hosting packages.
SiteGround is the best website hosting I have ever used, bar none. Dev4Press and few other websites are hosted on SiteGround Cloud server since January 2, 2016, and this review provides details about server performance and complete SiteGround experience so far.