There are a few good options:

We have been syndicating with SFS for 5 plus years in thousands of deals and they have never missed a payment and have a sick system

We syndicate with Capital Stack and it runs like clockwork

We also recently started syndicating with Everest and Fact business and that is running extremely smoothly

I think these days everyone offers syndication but you need to pick and choose who you decide to actually put your money with. Some companies may have great systems but only a few can truly be trusted with your hard earned money