Indeed, I believe 512x342@60.15 is almost certainly within the range of what every LCD these days can sync to.
Fun bit of trivia: Compact Macs also used the video scanning sync timing to feed the audio DAC, producing 8-bit audio at 22.2kHz. Pretty good for 1984!
Many will go down to 15kHz (CGA), and some EGA modes also use 22kHz: