If the plot is tilted so that a North-facing toilet seat actually faces NNE, will it work?
Yes, it will work. A slight tilt is acceptable; it is a treatment in any case.
Related questions
How is a boring in the North, NNE and North-East?
Borings in the North, NNE, NE and ENE are very good, and the North-East is the best. Never bore exactly on the North-East diagonal corner, the seat of Shikhi devta.
If only a bathing area is in the North and the WC is removed, is that fine?
Yes, absolutely. A room used only for bathing is fine in the North or the East; the East is the ideal place for bathing.
If the North of a flat or house is polluted, for example by a toilet, should we advise removing it, and is a pooja needed afterwards?
Yes, advise removing it: the North is Kuber's place, and keeping filth at the place of wealth is like putting dirt in the mouth, so wealth cannot grow. After any demolition do a Vastu pooja; even a short one is enough, offering 45 small pieces of gud to the 45 devtas or invoking the nine lords with Bho Indra Vastu Dev Vastu Shanti Kuru Kuru and so on for each direction, with Brahma at the centre.
In a three-floor building our North toilet was removed, but the upper floor's toilet is still above our North; does it affect us?
It falls under surrounding (assisting) vastu and affects you about 10 percent. Its energy can be treated and blocked if you can reach it. Do not build a temple in that North spot; at least never keep God beneath a toilet seat.
My Jupiter is exalted and my door is on N6-N7, towards the North-East, yet we have had no problems. Why?
The Ishaan (North-East) corner belongs to Jupiter, so people whose Jupiter is exalted can keep their door there. This shows how the birth chart decides which door suits a person.
Our house has a badly polluted North with a bathroom, and the family faces many problems and quarrels. How can it be corrected?
The North must be corrected and the land energy improved. Where the energy is good, any defects present give only about half their bad results. Household quarrels (grih klesh) are natural while such defects remain.