I find the best ones are like the one marktulley2000 described. Cocksuckers at ground level and cocks on a ramp that elevates them. This way everyone can stand.
Last one I frequented was at Steamworks. I started sucking off a hot daddy type with a big cock, and then his friend got excited and wanted to join in. They took turns using my throat and at some point the friend went away...maybe feeling left out I thought. I went back to work sucking the daddy and next thing I knew there was a dick between my cheeks. Turns out the friend had come down to my level to fuck me while the daddy watched. He kept pumping in and out while holding my head down on that fat daddy dick till they both came. And I'd thought glory holes were boring...