Tampines stretches from the Simei end to Tampines North, and moving between them takes time once the roads fill. That is the core problem of running Google Ads here: the map looks compact, but a crew is not.
Plenty of people search town-level terms, so island-wide firms bid on them widely, and small local firms get squeezed if they use broad matching and a big radius. The better route is precision: town areas, MRT-stop phrases and specific services.
Tampines Mall, Our Tampines Hub and Century Square attract searches from shoppers who are not customers, so blocking those searches matters. Agents work under CEA, and trades may need NEA, BCA or PUB standing, so ad claims should match.
Budgets and reports are in S$, with GST at 9% noted.