I was wondering if there's anyway to make crystallic cannons at the start of the game, like preplaced or something, at least my a computer do it? Please help.

"Crystallic" as in... The effect of the arbiter spell? Stasis field? I'm terrible with terms Basically what I got out of that was "do something to photon cannons"

He wants working photon cannons that look like as they would still be warping in. Effect is that you see the shape of the photon cannon but its "skin" is covered with blue waves which looks crystallic.

Crystallic Cannons Tutorial-Link

The point is that WHILE the cannon warps in you remove the pylon powering it thus stopping the warping. But then you have to enable the doodad state of the cannon to make it shoot.
This makes clear, that crystallic cannons can't be preplaced. If you find a way to make comp build cannons and detect it before the warping is complete, you could use a comp... But I can't think of a reliable way to do it.