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Yes we do indeed and it can potentially improve the speed of your site/s significantly - BUT there are possible dangers, see below for more details.

How To Enable PHP 7.X?

In each WPX user's admin area, there is a switch for the PHP version next to each website in that account (go to Manage Websites-Options-PHP Version):

BUT please note that PHP 7.X might not be supported by some of the plugins and themes you use. Be sure to check your website/s are working smoothly after the upgrade.  

If unsure, check with the developers of your themes and plugins BEFORE enabling inside your WPX admin panel OR test it by switching to PHP 7.X and reverting back to an earlier PHP version if your site stops functioning correctly.