You have several options. The closest ramp is at Hackneys Marina on the Margate Causway. There is also a free ramp at Ski Beach at the end of Dorset Ave in Ventnor Heights. In Somers Point you have the ramp at Somers Point Marina on Bay Ave and Kennedy Park just south of the Crab Trap Rest. Also you may want to consider the new free ramp under the causeway bridge leading into Ocean City next to Waterfront Marina.
Yes watch do Dorset ave at low tide, it's very shallow past the concrete landing
Eelball is right, the new ramp next to the new bridge is very nice. The concrete runs very far under water and it's a steep ramp which I like especially at high tide. I've seen some very large boats being dropped and picked up at the lowest point of the tide with zero issues