It is meant to be played on the GW/FW battlefield terrain tiles and it is meant to replace a title, the actual unit is the bunker/walls, so there are no rules for placement on normal terrain. See link > https://www.forgeworld.co.uk/en-US/Realm-of-Battle-Industrial-Sector
Its up to you, your opponent and the TO. For friendly games for sure i would allow it, but it would have to be on a section of the map that best fits best in your DZ.
It is 300pts base with 1 gun, but remember its only 20 wounds with a 3+/5++, its weaker than a knight, and it will die faster than one too. If you are fighting knights its almost pointless if you go 2nd and it costs as much as a knight (400pts B.c you'll buy the other anti-tank gun).
IDK what you are reading, but its 4D3 shots base, tho it is S16 -4 2D6 6's deal addition D3 MW's, and that is why ll Knights will shoot it and kill it, Hitting on 3+ and wounding on 2+ for 2D6 damage will hurt them badly.
But if you wanted to try it out, go for it.
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AoS: BoC 9k, CoS 3k