If they're paying and don't care, get a nice SonaSite linear probe. They're excellent. If cost is an issue, the Butterfly probe is perfectly adequate for PIVs. Sure, something that costs $20-30K will be better than something that is $2-3K, but I've used worse ultrasounds than the Butterfly. It's good for what it is and should be all you need. I've used it for arterial lines, PIVs, and even an emergency IV CVC once. It's super convenient that the app automatically turns on when I plug it into my phone. Even when I have the ultrasound on wheels available, I sometimes prefer the speed of access rather than having somebody bring the other probe, power it on, etc.
A surgery center probably should invest in something on wheels though unless they're really strapped for cost.