Depending on how much of my stack is in the middle pretty much any pair will do.
Gut shot would be a nice cheeky bonus.
Obviously don't if there's a pair on the board cus that f**ks us up.
$100 level stacks before the hand
$20 each goes in pre
if oppo Cbets pot we assume its for stacks
we get 6/4 - you happy with 1pr?
pretty impossible to say without a more specific example - but i know a lot of people stack off far too light in these spots with 1p hands and its a pretty huge leak.
but in the borderlines you gave, $100 (100bb) stacks pre-hand so assuming he is 100% pot commiting himself on the flop we need about 40% (slightly less i think)
(assume villain has AAxx 100% of the time)
HERO -

Flop

pretty easy stack off BD flush, bd striaght and top pair with 3 decent kickers. Still its pretty close.
Omaha Hi Simulation
600,000 trials (Randomized)
board:

Hand Equity Wins Ties
AA** 57.22% 342,676 1,290
42.78% 256,034 1,290
Another example - same flop

our hand -

Omaha Hi Simulation ?
600,000 trials (Randomized)
board:

Hand Equity Wins Ties
AA** 82.65% 494,447 2,956
Ah

17.35% 102,597 2,956
Another example - same flop

our hand -

Omaha Hi Simulation ?
600,000 trials (Randomized)
board:

Hand Equity Wins Ties
AA** 64.75% 388,267 434

35.25% 211,299 434
Basically you just wanna be super careful about a) what your calling 4bets with vs tight 4bettors, and b) exactly what your stacking off cos you can defo loose a lot of money in these hands, speshly if you're a bit deeper.