I'm asking because we play on a grid and while DMG p.251 states that 3 or 4 lines blocked by an obstacle gives 3/4 cover if the attack can still reach the target, it doesn't state what happens if the attack can't reach the target. I assume total cover but I might be wrong. And, as in the question, what if more than one creature each blocking 3 or 4 lines to a target. Would it create a 1/2 cover (as per Sage Advice Compendium), 3/4 cover, total cover or something else? also considering that only the best degree of cover is applied when more than one source of cover is there, if multiple creatures can ever create total cover.
I find all this to be confusing.
thanks for clarifying.