At 3.0% gross, there is very little room for error. Even if operating costs absorb only 20% of rent, the yield falls to about 2.4% before financing and tax. I would not proceed on an estimated insurance figure: get a quote based on the actual property, construction and intended tenancy. Also...
I partly disagree with delaying the viewing until every paper is assembled. If appointments are available and travel is easy, an initial visit can quickly show whether the layout and condition are worth pursuing. But I would not negotiate seriously or incur substantial costs until the title...