In most jurisdictions it's required that any electrical work means taking out a building permit. Normally, when you hire an electrician, he does this and you may not even know it happened, but it did.
If he fails to take out the permit, he can be fined, and the fine is way, way higher than he charged you (typical here is $2000) so trust me, he won't be willing to neglect the step.
If you do the work yourself, you can, but it is supposed to be inspected, which means you are supposed to take out the permit yourself, and in some places you might need a licensed electrician to sign off on your work or do the last connection to live AC.
Lots of Audio guys ignore all of the above, but it can become a problem when you try to sell your house, as the record for the electrical work won't exist, and the new buyer might be required to take out permits for all unpermit-ed work. Aside from the expense, this brings up problem No2, which is what I suspect the OP ran into with the "tamper-proof" requirement.
When you do modifications to your home, it's exactly the same as new construction. In other words, the mods must meet the *current* electrical code. Things that are perfectly fine in an existing home may not be fine if a change is made. So existing outlets could be A-OK but any new outlet, including a simple replacement in some circumstances, might have to be current code compliant.
Monoprice is great for a lot of things, but I would buy my electrical parts from the usual sources, personally (Leviton, Pass & Seymore, Legrand, Hubbell, etc). There is too much safety risk with offshore sourced products from dubious brands, there are regular instances of counterfeit CSA and UL approvals on electrical products from China, and the cost is not unreasonable for a known good outlet.
Remember ... your house CAN burn down, even with perfectly good work and perfectly good components in the power system. Why throw another unknown in the mix?
" ... It's not rocket science. Just trust your ears. You can hear as well as anyone else what sounds good and what doesn't. Given the chance to listen to all these different things, you can tell why people like [different Studio Recording Consoles]. It's not that hard to figure it out, if you hear them both in front of you — it's pretty obvious what sounds better. ..."
-Jay Masicus (Record Producer)
Last edited by Johnny2Bad; 04-14-2017 at 01:50 PM.