Check the known problems threads of the brand reviews.
Giant, Trek, Cannondale, Gazelle, R&M are huge & have few complaints. They have dealers to deal with any problems. Smaller sales brands Blix, Kona, Canyon have few complaints but maybe just because the sales are low.
You can save money on battery if you only need to go 10 km. 10 AH should be enough. OTOH the bigger the battery the fewer times you have to remove it to charge it. Biggest savings on battery is not buying a patented one from a mid-drive company like bosch or shimano. Replacements are >$1000 and right now SH is not available in US. Batteries are good for about 1000 charges.
All motors & batteries are made in *****. Some are okay, some are sleazy. I find $221 ebikeling geared hub motors work fine on my hills & load, wear out in ~4500 miles. Replacements are cheap and don't have to come from the same company. I'm using $23 used bafang motors now. Loaded up on 4. If the cables match, takes less time & tools to change a hub motor than a chain. Watch out on 3rd party batteries, some are great & mid priced, some are ****. Littakal , jennie Mao & em3ev have some fans on here.
You'll need a 54 or bigger frame. Some brands come in sizes, others don't.
I find 2.1' tires avoid the need for suspension at the speeds I ride. 9 mph average, peaks of 30 mph down hills on perfect pavement. Knobby tires on road are cheap & roll over the metal,glass, tire shards that cause most flats. I wear out 90% of them without a flat, as long as I change out with knobs >3/32". If you have goat thorns in your area, liners, slime, armor inserts and $60 schalbe tires may still be required.
Don't forget some cargo attachment to carry security accessories for work. My 1/2"x6' sling & lock weigh about 10 lb. Can fit in a fabric grocery bag hung from a book rack on my $45 throwaway bike.
Edit, giant uses a yamaha motor which is pretty good & can be pedaled unpowered without drag if anything happens. Bosch motor except the most expensive does drag. All mid-drives eat more chains than my bike. I get 5000 miles per inexpensive KMC chain.
