So you change your DNS settings.. Then what? Still depends on the DNS server routing your connections from the blocked app to their servers and said servers accepting the DNS server as legit.. I don't use MangoTv and so you'd have to test yourself... Personally, security risk.. i don't simply use DNS servers plucked off the public internet.. Get a paid premium VPN instead.. the really good ones ain't cheap and should work..
Kodi does not require changing your DNS servers to operate.
Meaning, there's a Teamviewer software for computers which can access the box too.. Not just from a mobile phone/tablet...
TLDR: Can control android device from PC..
If you like all sorts of crap being installed on your box.. Crap waiting to breakdown and trust me, breakdown they will.. Then sure, use some "auto-configure/script", bla bla... Nothing beats manual installation and maintenance.. You know exactly what goes in or out and when. Cleaner, leaner machine.. IMO.
Good luck..
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Come, Post your box to me... Pay me just RM1K and I promise to setup nicely and most importantly,
no need to recruit anyone else... Your family and friends will thank you..

.. You'll use for "lifetime" or whenever your box burns..
Page one and the last few pages of this thread has recommended boxes... Read!! It's an easy decision once you read.