closed loop for 90 gallon?

[dunham16]

I was forced to take down my 90 gal tank about 2 yrs ago and thankfully i can set it back up know. I learned a lot from the mistakes i had last time and would like to make the set up better this time. One of the things i was thinking about was drilling my 90 gal rr for closed loop since powerheads take up too much room in the tank. Question is what the placements of the feed and return should be and what would be the best pump for the job. I have searched all the 90 gallon builds and can not seem to find anyone who has drilled for closed loop. I would like to get maybe 30x turnover in tank what would be the best pump to do this. If anyone could point me in the right direction it would be great.