We are not alternative for Apple Enterprise Developer account or Apple Developer Account. If you are using Apple Developer Account, you have to Add the UDID of all the devices while you export the ipa file. Apple will not allow you install the app if it does not find the UDID in the ipa.
You will be violating the Apple License Agreement if you are using Enterprise Developer Account to distribute the app to public.
From 2018, apple will allow the App distribution only in Supervised Device. You have to wipe the device to enable supervision on a non-supervised iOS device.
Thanks and regards
Hexnode Support Team
+1-866-498-9407 (US Toll Free)
+44-(800)-3689920(UK Toll Free)
+61-1800165939 (Australia Toll Free)