Both FT8 and WSPR have been given a try on 40.680 MHz. Apart from Hugh HC02 in Portugal, I have had few spots this season. My impression is there are fewer people on than last year.
I know Es has been less good until recently and things could change. For those experimenting on 8m, the more stations on the better, with widespread monitors, even if unable to TX.
Some quite odd antennas may well be good enough with Es, so if you have a RX capable of monitoring 40.680 MHz, that is probably all you need.
If 28 MHz looks promising, it may be worth monitoring 40.680 MHz.
This is the real boundary between HF and VHF and a lot may possible.