Hi
Problem 1, you can only use it to monitor your own wordpress sites, It cant handle any other web URL, pages, domains you don't own. If they insist that it can then set it to monitor a webpage that you can turn off and you will see that it wont be able to detect that the page is down.
Problem 2, They want you to use whatsapp for support (The most used platform for scammers and unreliable business). I recommend that they use ticket system like zendesk insted.
Problem 3, The SMS that's included in AppSumo Tier 3 and 4 is not included in your plan at Uptime Monster. Inside your UptimeMonster account when you check what's in your plan you wont see anywhere SMS.
Also the founder said that the function is turned off for now. but I still we expect it to show under our paid plan. SMS is one of the main reason to get T3-T4.
Problem 4, Adding users inside Uptime Monster, I followed the instruktions: https://uptimemonster.com/docs/user-management/invite-user
To me this is the most unprofessional way to add a user. Because guess what!? it does not work... I followed guide and ended up with 2 other accounts that uses the free plan and did not even got added to the main organisation account, when using that invite link that takes you to the pricing page.
My recommendation is, do you shelf a favor and don't buy this. - Refund -