If those were my requirements then I’d be looking at Synology.
Currently using a Windows PC with Stablebit Drive Pool to pool about 10HDDs into one consolidated pool. Nice way to get a stack of storage and to repurpose an old PC I already had, but for a low effort option Synology would be my pick based on all the reports I’ve heard about it being a top notch option. My PC is fine but when things break you need to be able to troubleshoot a Windows setup, which is fine but maybe not for “mum and dad”.
Just pick a NAS from them that does what you need. Whenever I look at them it seems to be about determine how many drives you need and whether you want a high performance one (to run Plex servers and the like) or a low spec one that just does storage and some less intensive stuff.