Nikon Speedlights spin around 180 degrees for a reason. They have a built in slave system. You just have to make sure the sensor is pointed towards the controlling flash. There is a description in your manual at what angle they are effective. Cheap wireless radio triggers only trip light set in manual mode. The more expensive ones actually communicate and use i-ttl. With product shots, you can just set any flash with an optical trigger on manual. Once you have the settings you like, you just leave them there for every shot. Even $70 cheap china lights work just fine this way. When using optical, they just go off when sensing a bright flash. Those lights from Amazon will be fairly close, but for product shots that will not matter. If they just want items on the table, that light kit from amazon will be just fine.