Seen your post. Guessing it's a bit late but basically you can do what you want to here.
You set up the auction spec according to what you want to buy and how you want to buy it. This may include a statement that you seek to purchase most suitable / highest quality / however you want to put it... solution and that award will be made on basis of best overall solution and not necessarily highest bid. Depending on the jurisdiction you could also add a more general clause stating you reserve the right to award on another basis etc... each jurisdiction will know what is acceptable for their own jurisdiction in terms of those types of clauses if you do not have process or compliance or other practice documentation that guides this.
Your award process will take place after the auction in accordance with whatever conditions you made known within the auction parameters.
Having said all the above, it is much more likely on an auction, than on an RFP, that you will take the lowest bid - simply because if you have selected your suppliers invited to the auction, and done a robust spec of what it is you are running the auction to purchase - then theoretically what you are buying in an auction may be more easy to compare across bids. So it seems to follow more naturally that if those things have been done well then it should be easier to compare bids so lowest bid may naturally drop out as the one to take more often in auctions than in RFP's.
Thanks for the message
Your reply has sound advice in, thanks.
I was specifically looking at these three countries as one of my colleagues believes some legislation surrounds the use of eAuctions in these three countries.
Are you aware of anything?