Use translucent/opaque “milky” acrylic, not clear acrylic, if you want the surface itself to glow and spread the light from below. Clear acrylic mostly lets light pass through without diffusing it, so it won’t create an even luminous surface.

For a white product-photo look, the bigger issue is lighting balance: make the background/table bright enough to blow to white, while keeping the product exposure a couple of stops lower so you retain detail. If the base is too reflective or glossy, you may get unwanted reflections; a diffuse surface is generally easier to control.

White paper is often used because it gives a diffuse background, but if your translucent acrylic already gives you the look you want, paper may be unnecessary and will also cut some light. Expect the acrylic to absorb light, so stronger lights may be needed, but there’s no single wattage answer—it depends on your lamps, modifiers, distance, and desired exposure.

A translucent acrylic sheet around 2 mm thick can work well for this kind of backlit table.