Coolant tanks keep blowing?

If you mean the reservoirs keep failing it could simply, be they were beat up in shipping. However, it could mean that there is pressure in the system. You say they both leak in the same place, could you take a picture and post it on here so we can see the damaged area?
If it's a mounting point it could be stress, if it's a hose bib it could be the hose is moving and flexing the tank and cracking it. Seeing it might make it easier to tell. You might want to watch the engine with it running. Have someone start it, hold the brake and put it in gear and step on the throttle, the engine shouldn't move very much, but age and heat could have damaged a mount so the engine moves and flexes in ways it shouldn't.

That is the area that the turbocharger cooling return line attaches. Your engine is stock with no "upgrades" correct? Excess heat from the turbo might be a contributing factor to failure. Has the engine temperature gotten higher?

That should be okay. Other than heat or physical damage I don't know of anything else that would cause it to fail in that area, there isn't anything to hit it that I can think of. If the turbo is running hotter for some reason it could make that area weaker and with the baffle it could expand and crack the plastic.

A bad cap would cause higher pressure but in your picture that is a failed tank, not a weep hole.

The cap could be tested but replacement might be cheaper. Let us know what happens.

So, is the reservoir still okay and is the problem fixed with the radiator cap?

Thanks for letting us know, we are here to help, please use 2CarPros anytime.