Hey there and welcome to the Community, @user3199 
Based on the info from the net, Custom HTML sections are supported by NetSuite platform, which means the installation of our widgets should be supported there too.
You can see how the widget works on the website from our Real Use Cases category:
Unfortunately, we don’t have an installation tutorial for the NetSuite platform, but our Support Team will gladly assist you with it. Just request the widget’s installation in your dashboard and our support agents will help you out 
If you have any questions left, we’ll be happy to advise!