4G LTE cellular WAN technology bonds multiple SIMs for reliable high speed within 2 days.
For reliable, high speed connections you need to bond multiple SIMs from multiple carriers, and choose carriers that work well at each location. Don't settle for less.
How many SIMS, from which carriers, will give you the performance you need.
Whether an out-of-the-box, two-working-day deployment will work for you.