Does immigration in Bangkok require an outbound ticket or hotel booking for a visa exemption extension?

As a general rule there is no onward travel requirement at IT Square Laksi Plaza to get a 30 day extension on a visa exempt entry.

In Bangkok you do not go to the the main immigration office at the government complex on Chaengwattana Road for a 30 day extension on a visa exempt entry

You go to IT Square Laksi Plaza 3rd floor (there are copy/photo shops on either side of the immigration office there)

This is where it is (about 2km from the main immigration office)

DO NOT Hi-Jack unrelated threads. You posted your BANGKOK question in a thread about Chiang Mai