So, I pay a company for a website hosting with PHP and they have an autoinstaller of Nextcloud.
After installing it, you can go into settings, add a S3 bucket you can get with free Storj account.
You can check my hosting out at sldc.eu
They are really cheap, but I am not sure how you would buy hosting if you are not Polish. Also don't expect superb tech support. It's practically call line only.