The Alien versus Predator versus The Terminator comic posits that The Terminator war happened, ended in about 2032, and then the Alien films happen after they rebuild. Skynet had sleeper Terminators who activate in the future when they have the most chance of winning.
I guess you could make it canon to Alien if you assume that the sleeper agents were sent back in time and the war never happened, but that contradicts the intent of the comic. But, hypothetically, you could have your Alien vs. Predator vs. The Terminator vs. RoboCop timeline that includes all of them. It's just that in Alien, there was never a future war throughout the early 20th century so the comic obviously isn't canon. Unless the Alien Tetralogy occurred in both the future war and the non-future war timelines, I suppose.
I'd probably say every timeline before RoboCop versus The Terminator and Death Valley would be read immediately after Terminator 2, and then you'd assume RvT, Death Valley, Dark Years and Superman versus Terminator (it's part of the Death Valley timeline despite being a crossover) would be canon to AVP, and then after you watch and read the entire AVP timeline, you'd go back and watch/read every other Terminator story. It'd look pretty silly really. I guess you could explain that the original version of the Earth War trilogy, Alien 3: The Original Screenplay, Alien: The Original Screenplay, and all the RoboCop timelines are a consequence of Terminator time travel if you were going to take that and run with it.