A long throw ALR screen produces speckling, image uniformity issues, and hot spotting all by itself and should be avoided no matter what.

I'm not sure where you read that a ALR screen of any kind will help, but that doesn't match up to reality of what I have EVER seen with a long throw ALR screen. They just look like garbage.

If you're in a dark room, then make sure the room is painted dark and truly controls light. From there, a lower gain white screen will give the best results.

It's best to spend money treating the room, not buying a bandage of a screen to try to fix a bad room. A good room, and a good projector, with a cheap screen will look better than a bad room with a good projector with a high end screen.

And, while the N1 is a solid product, it won't have the contrast of a model like the Epson 5050UB or some of the better competition.

If fixed frame, I'm rather fond of the Silver Ticket Products screens.

Their matte grey screen is a very entry level model screen without positive gain and works well to improve contrast a bit while not introducing speckling.

Their matte white and matte grey are both decent choices...
https://www.silverticketproducts.com/collections/all/category_projection-screen+ratio_16-9+frame_standard+condition_new+style_matte-white

For a really nice screen material (as it should be) look at the DaLite HD Progressive screen with .9 gain. It's a really top tier product.
https://www.projectorscreen.com/hdprogressive09