Cincinnati doesn't have the best rates but GI with 10 eligible regardless of participation for FUL, WL and various term policies. If small-mid market this is awesome.
For 100+ market, I'm preferential to MetLife, Guardian, Principal, Unum, and Assurant. Mass Mutual has some good stuff too but I've had some meh experiences.
You may also want to look into something likelse VB
in a Box.
Guaranteed portable gets a bit trickier. Cincinnati has it, as does Washington Mutual. Others are negotiable with the carrier if a large enough group...