It's such an enigma to me. It's an arc-dodger platform, but at I1 it definitely won't be doing any dodging. They would make excellent blockers, except that means you're sticking one out to get shot at by the blocked ship's squadmates, and possibly not getting a shot yourself.
Obviously you don't want to joust with these things, but flanking usually leaves one group way too vulnerable and then the other group has its work really cut out. Playing Ring-around-the-obstacles has worked for me a bit (mods + boost is really good with that dial) but that depends on getting your opponent to split up or come through the rocks in the first place, which Alphas aren't that well equipped to do (unless I'm just really bad at flanking?).
These things never want to be within range 1 or even 2 because they can't guarantee it will be outside of arc and their chances of blanking out against 3-4 hits means a 1-shot death is a very real possibility, even with an evade. At I1 they're not initiative-killing anything either. You could fly them in a block, and though it basically guarantees that one of them dies before shooting, it might let you take off a juicier target in return. If you lose two though, it gets way worse, so it's probably better not to roll the dice on that one.
I've had decent luck sitting back at R3 with a focus. I1 means that if I haven't used it when it's my turn to attack, I'm free to spend it like there's no tomorrow, and 4-5 defense dice with focus is decent insurance in spite of being RNG. The trick is that you can't sit pretty at R3 for very long – as soon as you try to peace out, someone else catches you in that miserable R1 and you go pop.
To everyone who's having luck with Alpha Interceptors or who might have better ideas: How on earth do you make them work? I love interceptors and swarming them has been a dream of mine since 1st edition, but it was never remotely viable then.
Disclaimer: I've been running them against 5 cartel marauders in FlyCasual. Naturally that's a fairly poor matchup in the first place and the computer's deployment system makes it even more of a struggle. Maybe playing against an IRL opponent would actually be easier?