Calcium nitrate - add first or last?

I'm hoping to get a definitive answer about this as there's a lot of conflicting info on the web!
Should a nutrient with calcium nitrate (CalMag's etc) be added first before any nutrients, or last after all other nutrients?

It doesn't matter but if it makes you feel better add it after micros. ?

It won't interact because it's soluble with other nuterient bases.

Add before. pH buffers.

Silica-cal/mag-nutes...Adjust.