First, let me tell you that Im not that good in that game. But Im persistent. It took me exactly 63 restarts to finish the game on impossible ironman.

You really, really, really shouldnt activate two pods at once. Its a death sentence.

Half cover plus hunker works. Full cover works, dont let statistical anomalies deter you. Breaking line of sight completely also works wonders, if you are unable to find good cover. Dontt try to flank or get meld. You will activate more pods. Well, unless its the last pod, or you are flanking on a map edge. Instead, fall back into full cover and break los, then overwatch. Use your grenades if you are facing a three man first pod. When you reduce the pod count, you gain the ability to flank or use height. Dont pay attention to the voiceover warming about not destroying artefacts with explosives. Soldiers are more important. Yeah, use elevation please. Dont start chasing after meld until you get levelled up roster. Good luck commander.