You can configure the SPF records for Google on our hosting, but not the DKIM records.
Are you using Hover’s nameservers? If so, then all DNS records for your domain should be configured at Hover, both for your email and for your website hosting with us. For the part of integrating our web hosting with Hover’s nameservers, guide should help you with that:
If you are using our nameservers, then Hover’s support is mistaken. You don’t need to configure anything else for our hosting, because our nameservers already have the right records for our website hosting, but not for their email hosting.