catbird seat

catbird seat - a position of power or prominence - завидное положение

in the catbird seat means "in a position of ease" - в выгодном положении

Cassell’s Dictionary of Slang

CATBIRD SEAT (U.S.) a privileged or advantageous position. The catbird takes up a high, exposed position to deliver its song. The image of a cat looking down on a targeted bird.

see also
[как у Христа за пазухой]
[как сыр в масле]