ASIC's make way more than GPU mining.  A top of the line 5 rig 1080ti machine will only earn you about 10 to 12$ a day after elec.  That's small numbers for a $4,500 machine.

May as well buy a L3+ on eBay for 5k.  It'll earn double the GPU miner.

Truth is GPU mining doesn't compare to Antminers.

My plan is to put each D3 on a separate 20amp circuit as they run 1200watts.

I was thinking of doubling up and putting 2 L3+ machines on one 20amp circuit since they run 800watts...  Upstairs in my house 2 rooms share a 20amp circuit - so 1 L3+ in each room.  

I was thinking about using extension cables to run all the Antminers downstairs so I don't have to run my 2nd AC unit upstairs (costs $150 to $200 a month 6 months out of the year just upstairs alone if I run it) or should I not do this?  I read the extension cords have to be fully extended, at least 15amp rated and only 1 machine per cord.

Will the Antminers need to be connected to a power surge strip or does the ++ Power supply Bitmain sells handle power surges?

Thanks

Summation

1. Should I put 2 L3+s on a 20 amp circuit, using separate outlets on the circuit?
2. Running 5 or 6 extension cables from upstairs to downstairs to run all my machines downstairs so I only have to run the downstairs AC half the year?  Too dangerous?
3. Do the Bitmain ++ Power Supplies need to be connected to a separate surge protector then into the wall?

Newbie questions here:

I will have an L3+ and D3 in soon and I'd like to know the accurate URL, Username and Password combo for the L3+ and D3 for using zpool

I am guessing:

L3+
URL: stratum+tcp://scrypt.mine.zpool.ca:3433
Username: My Bitcoin Address
Password: c=BTC

D3
URL: stratum+tcp://x11.mine.zpool.ca:3533
Username: My Bitcoin Address
Password: c=BTC

Also...  In which particular case and why will I need to set a custom difficulty?  How would I know that instead of the above, I would to specify difficulty, and what would the difficulty be for an L3+ and D3?  Thanks.

-o stratum+tcp://<algo>.mine.zpool.ca:3433 -u wallet_adress -p d=64