When stapling nailing down you only have the fastener holding the edge of the board down.
Installing 7 inch engineered hardwood flooring.
Engineered hardwood floors may be installed over wood subfloors using staples or flooring cleats.
When installing engineered wood planks or strips by nailing or stapling it is necessary to use the proper type of flooring stapler or nailer made for the thickness of the engineered wood flooring that is being installed.
If a wood subfloor is in place measure the moisture content percentage mc of the wood subfloor and the engineered wood flooring to confirm all the engineered hardwood is acclimated and suitable for installation.
Engineered wood flooring was once regarded as a pale imitation of solid hardwood but improvements in the product quality have eliminated this perception.
Solid hardwood may hold a slight edge in prestige for some people but the lower cost and easier installation of engineered wood flooring give it the edge for others.
Handling the engineered hardwood.
Regardless if installing a 3 wide engineered hardwood or a 5 wide engineered hardwood plank you are not using any more fasteners despite the increased width.