I,ve seen both net,stop end ways years back,the Old Fella I go out with Prefers to let them travel,found this to be alot better.I let mine hunt around above and think it helps their nose.Found earths that coudn,t be seen this way,Bankings,in dense gorse etc.
Yer when were out with my mates terrier we just let her work on ahead and as you said they find holes what you never knew were there thumbs